USING COMMAS: RULES TO LIVE BY

We cannot say that the comma will always come before the conjunction and never after, but it would be a rare event, indeed, that we need to follow a coordinating conjunction with a comma. When speaking, we do sometimes pause after the little conjunction, but there is seldom a good reason to put a comma there. Use a comma to set off introductory elements, as in "Running toward third base, he ... ................
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